More than 758,000 registered voters in Pennsylvania do not have photo identification cards from the state Transportation Department, putting their voting rights at risk in the November election, according to data released Tuesday by state election officials.

The figures - representing 9.2 percent of the state's 8.2 million voters - are significantly higher than prior estimates by the Corbett administration. Secretary of the Commonwealth Carol Aichele has repeatedly said that 99 percent of Pennsylvania's voters already had the photo ID they will need at the polls in November.

The new numbers, based on a comparison of voter registration rolls with PennDot ID databases, shows the potential problem is much bigger, particularly in Philadelphia, where 186,830 registered voters - 18 percent of the city's total registration - do not have PennDot ID.